A silent guide type relief valve

Abstract

The present invention provides a silent, guided relief valve, relating to the field of hydraulic power systems, comprising a valve body, wherein a first spring seat, a compression spring, a second spring seat, and a valve core are sequentially arranged in the valve body from left to right. The central axes of the first spring seat, the compression spring, the second spring seat, and the valve core are located on the same horizontal line. A portion of the first spring seat extends into the valve body. A nut is sleeved on the outside of the first spring seat and locked to the valve body by the nut. An O-ring is provided at the connection between the nut and the valve body. The valve core is located at the right end of the valve body. The present invention improves a direct-acting relief valve into a silent, guided relief valve, providing good structural support for the valve core in operation and preventing valve core vibration. At the same time, the single flow hole is replaced with a multi-hole flow hole, allowing hydraulic oil to pass through the relief valve more stably, ensuring stable relief pressure and significantly reducing operating noise.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic power systems, and in particular to a silent guided overflow valve. Background Art

[0002] The overflow valve is a hydraulic pressure control valve that mainly plays the role of constant pressure overflow, pressure stabilization, system unloading and safety protection in hydraulic equipment. It is used in hydraulic power units (hydraulic power pump stations, hydraulic power stations, hydraulic stations) systems used in warehousing and logistics equipment, automobile repair and maintenance, agricultural machinery, construction machinery, machine tools, wind power, RVs and other fields.

[0003] At present, except for the seals, the other parts of similar overflow valves in China are mostly made of steel as the raw materials for the valve body, valve shell, valve core and other parts. Please refer to Figure 1 , which consists of a valve body 1, a compression spring 3, a valve core 5, an O-ring 6, a nut 7, a pressure-regulating screw 8, a plastic rod 9, and a retaining ring 10. Due to the condensation of water in the working medium (hydraulic oil), the relief valve housing, the valve body, and the valve core may rust or corrode each other, resulting in poor pressure maintenance or failure, and malfunction; at the same time, due to structural reasons, the opening hole, the oil inlet hole 11, and the main overflow hole 12 of the relief valve are all in the same position and are positioned by the spring, which will cause the valve core to vibrate due to the impact of the hydraulic oil flow, generating very loud working noise, causing sound pollution, and damaging the operator's hearing. Summary of the Invention

[0004] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a silent guided overflow valve, which uses copper and stainless steel materials as the materials of the overflow valve shell, valve body and valve core, avoiding the problem of rust and failure of the overflow valve. At the same time, the existing overflow valve adopts a direct-acting structure, which causes the valve core to vibrate during operation, affecting the pressure stability and generating a large working noise. The present invention improves the direct-acting structure into a silent guided overflow valve, so that the valve core has good structural support when in working state, preventing the valve core from vibrating. At the same time, the single flow hole is changed to a multi-hole flow hole, so that the hydraulic oil can pass through the overflow valve more stably, ensuring the stability of the overflow pressure and greatly reducing the working noise.

[0005] To achieve the above-mentioned and other related objects, the present invention provides a silent pilot-type relief valve, comprising a valve body, wherein a first spring seat, a compression spring, a second spring seat, and a valve core are sequentially arranged in the valve body from left to right, wherein the central axes of the first spring seat, the compression spring, the second spring seat, and the valve core are located on the same horizontal line, a portion of the first spring seat extends into the valve body, a nut is sleeved on the outside of the first spring seat, and is locked on the valve body by the nut, and an O-ring is provided at the connection between the nut and the valve body.

[0006] The valve core is located at the right end of the valve body, and there are two oil inlet holes between the middle part of the valve core and the right end surface of the valve body. There are multiple overflow holes at the contact surface between the second spring seat and the valve body.

[0007] In one embodiment of the present invention, the overflow holes include four main overflow holes and two auxiliary overflow holes. The auxiliary overflow holes are located on the left side of the main overflow holes. The four main overflow holes are evenly distributed along the circumferential direction of the second spring seat.

[0008] In one embodiment of the present invention, the compression spring is located in the middle of the valve body, the first spring seat is nested outside the left side of the compression spring, and the second spring seat is nested inside the right side of the compression spring.

[0009] In one embodiment of the present invention, the left side of the valve core abuts against the second spring seat, and the second spring seat and the valve core maintain synchronous movement.

[0010] In one embodiment of the present invention, the diameter of the valve body gradually decreases from left to right, and an O-ring and a retaining ring are sleeved on the outside of the valve body.

[0011] In one embodiment of the present invention, the valve core is made of 304 stainless steel, and the first spring seat, the second spring seat, the valve body and the nut are all made of H62 copper.

[0012] As described above, the present invention has the following beneficial effects:

[0013] This invention uses H62 copper as the main component of the relief valve and 304 stainless steel as the valve core, its moving part. This ensures that even if the hydraulic oil absorbs a large amount of water during operation, the relief valve components will not rust and cause malfunction or failure. The valve core component's structural design has also been optimized, improving the direct-acting structure to a guided structure. The first spring seat and valve body secure the compression spring and second spring seat, indirectly securing the valve core. This reduces vibration during the flow of hydraulic oil and significantly reduces noise during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of a direct-acting overflow valve in the prior art.

[0015] Figure 2 Shown is a structural schematic diagram of a guide-type relief valve disclosed in an embodiment of the present invention.

[0016] Figure 3 Shown is an initial state diagram of the guide type relief valve disclosed in an embodiment of the present invention.

[0017] Figure 4 Shown is a working state diagram of the guide type relief valve disclosed in an embodiment of the present invention.

[0018] Component number description

[0019] 1-valve body; 2-first spring seat; 3-compression spring; 4-second spring seat; 5-valve core; 6-O-ring; 7-nut; 8-pressure regulating screw; 9-plastic rod; 10-retaining ring; 11-oil inlet hole; 12-main overflow hole; 13-auxiliary overflow hole. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0021] See also Figures 2 to 4 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0022] See also Figure 2 The present invention provides a silent, guided relief valve, comprising a valve body 1. A first spring seat 2, a compression spring 3, a second spring seat 4, and a valve core 5 are sequentially arranged inside the valve body 1 from left to right. The central axes of the first spring seat 2, the compression spring 3, the second spring seat 4, and the valve core 5 are located on the same horizontal line. A portion of the first spring seat 2 extends into the valve body 1. A nut 7 is sleeved on the outside of the first spring seat 2 and is locked on the valve body 1 by the nut 7. An O-ring 6 is provided at the connection between the nut 7 and the valve body 1.

[0023] The valve core 5 is located at the right end of the valve body 1. There are two oil inlet holes 11 between the middle part of the valve core 5 and the right end surface of the valve body 1. There are multiple overflow holes at the contact surface between the second spring seat 4 and the valve body 1.

[0024] In this embodiment, the left side of the valve core 5 is a fixed part to prevent excessive noise during the circulation of oil, and the right side of the valve core 5 is a guide part to ensure that the valve core 5 moves in a horizontal straight line.

[0025] Based on the above embodiment, the multiple overflow holes include four main overflow holes 12 and two auxiliary overflow holes 13 . The auxiliary overflow holes 13 are located on the left side of the main overflow holes. The four main overflow holes 12 are evenly distributed along the circumferential direction of the second spring seat 4 .

[0026] Based on the above embodiment, the compression spring 3 is located in the middle of the valve body 1 , the first spring seat 2 is nested outside the left side of the compression spring 3 , and the second spring seat 4 is embedded inside the right side of the compression spring 3 .

[0027] Based on the above embodiment, the left side of the valve core 5 is against the second spring seat 4, and the second spring seat 4 and the valve core 5 maintain synchronous movement. When the valve core 5 moves to the left, it drives the second spring seat 4 to move to the left synchronously.

[0028] Based on the above embodiment, the diameter of the valve body 1 gradually decreases from left to right, and an O-ring 6 and a retaining ring 10 are sleeved on the outside of the valve body 1 .

[0029] Based on the above embodiment, the material of the valve core 5 is 304 stainless steel, and the materials of the first spring seat 2, the second spring seat 4, the valve body 1 and the nut 7 are all H62 copper.

[0030] Working process:

[0031] See also Figure 3 , in the initial state:

[0032] Because there is no pressure in the "oil inlet hole", the valve core 5 is tightly attached to the valve body 1 under the spring force of the compression spring 3, and there is no gap between the valve body 1 and the oil inlet hole 11. At this time, the oil inlet hole 11 is in a closed state; at the same time, the second spring seat 4 also seals the main overflow hole 12 and the auxiliary overflow hole 13, so the hydraulic oil cannot flow out from the oil inlet hole-valve core-second spring seat-overflow hole. At this time, the overflow valve is in a closed state or an initial state.

[0033] See also Figure 4 :

[0034] When the pressure in the oil inlet hole of the oil pump gradually rises, the force acting on the valve core 5 also increases. When the force is greater than the initial pressure of the compression spring 3, the valve core 5 and the second spring seat 4 move to the left at the same time. At this time, the hydraulic oil enters the valve body 1 from the oil inlet hole and flows into the right end face of the second spring seat 4, while pushing the second spring seat 4 to continue to move to the left until the main overflow hole 12 is opened. Continuing to push the second spring seat 4 to move to the left can open the auxiliary overflow hole 13. At this time, the overflow valve enters the overflow working state. The pressure of the overflow valve depends on the pressure When the elastic force of the compression spring 3 and the oil pressure (oil pressure is the product of the hydraulic oil pressure and the valve core area) are balanced, the valve core 5 and the second spring seat 4 remain stationary. The hydraulic oil pumped from the hydraulic pump flows from the oil inlet hole through the valve core 5, the second spring seat 4, the main oil overflow hole or the auxiliary oil overflow hole, into the oil return hole, and then back to the oil tank. At the same time, in this working state, the fixed portion on the left side of the valve core 5 fixes the valve core 5 in the guide hole of the valve body 1, and the second spring seat 4 also partially slides in a horizontal straight line within the valve body channel. In this way, the hydraulic components in the channel through which the high-pressure hydraulic oil flows are fixed from both ends, reducing vibration and thus achieving the purpose of reducing operating noise.

[0035] In summary, the present invention improves the direct-acting valve valve to a guided valve valve, providing excellent structural support during operation and preventing valve core vibration. Furthermore, the single flow hole is replaced with a multi-hole flow hole, allowing hydraulic oil to flow more stably through the relief valve, ensuring stable relief pressure and significantly reducing operating noise. Therefore, the present invention effectively overcomes the shortcomings of the existing technology and has high industrial application value.

[0036] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A silent guide type relief valve, characterized in that: The valve body (1) comprises a first spring seat (2), a compression spring (3), a second spring seat (4) and a valve core (5) arranged in sequence from left to right in the valve body (1); the central axes of the first spring seat (2), the compression spring (3), the second spring seat (4) and the valve core (5) are located on the same horizontal line; a portion of the first spring seat (2) extends into the valve body (1); a nut (7) is sleeved on the outside of the first spring seat (2) and is locked on the valve body (1) by the nut (7); an O-ring (6) is provided at the connection between the nut (7) and the valve body (1); The valve core (5) is located at the right end of the valve body (1), and two oil inlet holes (11) are provided between the middle portion of the valve core (5) and the right end surface of the valve body (1), and a plurality of overflow holes are provided at the contact surface between the second spring seat (4) and the valve body (1); The plurality of overflow holes include four main overflow holes (12) and two auxiliary overflow holes (13), the auxiliary overflow hole (13) is located on the left side of the main overflow hole, and the four main overflow holes (12) are evenly distributed along the circumferential direction of the second spring seat (4); The valve body (1) has a diameter that gradually decreases from left to right, and an O-ring (6) and a retaining ring (10) are sleeved on the outside of the valve body (1); The compression spring (3) is located in the middle of the valve body (1), the first spring seat (2) is nested outside the left side of the compression spring (3), and the second spring seat (4) is embedded inside the right side of the compression spring (3).

2. The silent guide type relief valve according to claim 1, characterized in that: The left side of the valve core (5) abuts against the second spring seat (4), and the second spring seat (4) and the valve core (5) maintain synchronous movement.

3. The silent guide type relief valve according to claim 1, characterized in that: The material of the valve core (5) is 304 stainless steel, and the materials of the first spring seat (2), the second spring seat (4), the valve body (1) and the nut (7) are all H62 copper.

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